Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods. Causes of malabsorption syndromes include. 1  Celiac disease. 2  Lactose intolerance.  Short bowel syndrome. This happens after surgery to remove half or more of the small intestine. You might need the surgery if you have a problem with the small intestine from a disease, injury, or birth defect.
The exhaust manifold obviously carries exhaust away from the engine compartment. When the manifold fails to completely perform that function, fumes can enter the coach. This was not detected however in my coach so that telltale signal was missing. The manifold if leaking can reportedly injure the engine. And exhaust gases are used by the turbo system. If that is not performed well, you will notice a loss of boost (power) and mpg. If left unattended (repaired) the leak can also leak hot gasses into equipment and areas where it does not belong.
The center bolts that mount the manifold to the head had rusted in the bore through the manifold. No amount of heat or penetrant will get that bolt out. Finally had to stretch the bolt with wedges along the head and use a hacksaw blade without a handle to cut the barely exposed bolt.B Blaster is great on these often rusty bolts. Just put a plastic tube on the nozzle so you can direct a steady stream on the bolts. Soak them twice a day for at least a week. Smack the top of the bolt with a chisel or old screwdriver to shock-it. Mine came off with very little trouble... after 27-years.